measuring petrol/ethonol accurately
If this has been done before, I apologise, but I have not found anything when I have searched.
I am a team manager for a team of students who need to design, construct a three wheeled vehicle. The test is a 24 hour "trial" (more like a race ;-) )
We have been competing in a category for "Hybrid Vehicles" which an additional power source to asssist the rider. In our case it is a 50cc engine using a friction drive arrangement so we can disengage it if required or if we desire. The reason for this is that we only recieve 3 litres of petrol for the event............ This is my problem. I have not been able to measure petrol in the tank accurately enough. Over the last two years I have had one litre left or ran out after 21 hours.
I have been thinking of using a strain gauge or load cell to measure the weight of the tank. I'm thinking it could be as simple as powering up the load cell with the appropriate voltage, and measuring voltage drop across it, maybe with an added resistor. Or it could be made more complex by using a circuit to drive a number of LED's giving an indication of the fuel in the tank.
If anyone outhere has any ideas to do this simply and reliably, I would love to hear from you. If it is more complex then so be it.
Here is a link to the event to give you an idea of what it is about